netdev - Re: [PATCH 1/3] bnx2: Fix lost MSI-X problem on 5709 NICs.

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Message-Id: <20100427.143825.216754145.davem@davemloft.net>
Date:	Tue, 27 Apr 2010 14:38:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, jfeeney@...hat.com
Subject: Re: [PATCH 1/3] bnx2: Fix lost MSI-X problem on 5709 NICs.

From: "Michael Chan" <mchan@...adcom.com>
Date: Tue, 27 Apr 2010 14:28:09 -0700

> It has been reported that under certain heavy traffic conditions in MSI-X
> mode, the driver can lose an MSI-X vector causing all packets in the
> associated rx/tx ring pair to be dropped.  The problem is caused by
> the chip dropping the write to unmask the MSI-X vector by the kernel
> (when migrating the IRQ for example).
> 
> This can be prevented by increasing the GRC timeout value for these
> register read and write operations.
> 
> Thanks to Dell for helping us debug this problem.
> 
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Applied to net-2.6
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